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Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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
Transcribed Image Text:• Problem 1
• Air at 40 oC and 1 atm flows over a 5 m long wet plate with an average
velocity of 2 m/s to dry the surface. Using analogy between heat and mass
transfer. Determine the mass transfer coefficient on the plate.
• Extra information: at 40 oC and 1 atm, v= 1.702 *10-5
T2.072
• DAB 1.87 x 10-5 X
P
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- The sensible heat-transfer coefficient for a dry surface has been determined to be 50 W/(m2-C) at a certain Reynolds number. Estimate the total heat transfer to the surface per unit area at a location where the wall temperature is 10 C and the state of the moist air flowing over the surface is given by 24 C dry bulb and 18 C wet bulb. Assume that the Reynolds number does not change and the Lewis number is 0.82. Assume that the condensate present on the surface will increase the transfer coefficients by about 15 percent.arrow_forwardA 5.092 m3 rigid tank contains 100 Kg of saturated water vapour, What is the temperature of this water? If the tank is now cooled to 200 °C, what is the new dryness fraction?arrow_forwardthe latent heat of vaporization is about 2.44 x 10⁶ J/kg and the density (density) of the vapor is 0.598 kg/m³ at 100 °C per km. Determine the rate of change of the boiling point with altitude approaching sea level in °C per km. It is known that the density of air at 0°C and 1 atm is 1.29 kg/m and the density of water is 1000 kg/m³. Assume the air temperature is 300°K. The change in pressure with altitude is given by the relationship P(z) = P(0)exp - (mgz)/(kT)arrow_forward
- In a paint manufacturing process, two different colored paints are being mixed in an infinitelylarge drum.Paint A, with a concentration of 30% pigment, is pumped into the drum at a rate of 10 liters perminute.Paint B, with a concentration of 17% pigment, is pumped into the drum at a rate of 17 liters perminute.Both paints have the same density of 1.0 kg/liter.If the mixture is cotinuously stirred and drained from the drum at a rate of 22 liters perminute, what isthe concentration of pigment in the resulting mixture?arrow_forwardThe sensible heat-transfer coefficient for a dry surface has been determined to be 50 W/(m2-C) at a certain Reynolds number. Estimate the total heat transfer to the surface per unit area at a location where the wall temperature is 10 C and the state of the moist air flowing over the surface is given by 24 C dry bulb and 18 C wet bulb. Assume that the Reynolds number does not change and the Lewis number is 0.82. Assume that the condensate present on the surface will increase the transfer coefficients by about 15 percentarrow_forwardWater vapor is evaporated into the air at T = 25°C and P = 1 atm in a 10m x 100m water pool The distance between the surface of water and air outside of the container is 20 cm (Z2 - Z₁ 20cm) the humidity at Z₁ is XA1 = 2% and that at Z2 is XA2 = 1.9%. The diffusivity of water vapor to air at T = 25°C is DAB 0.282 cm²/s. Universal gas constant R = 0.00008205 .m³atm mol.K = NE Estimate the rate of water vapor (kg/day) evaporated at the surface of the water at z = Z1 |z2 Molar mass of water M = z1 18 g/molarrow_forward
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